Bug 1948045 (CVE-2021-3483)

Summary:	CVE-2021-3483 kernel: use-after-free in nosy driver in nosy_ioctl() in drivers/firewire/nosy.c when a device is added twice
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, adscvr, airlied, alciregi, bdettelb, bhu, blc, bmasney, brdeoliv, bskeggs, chwhite, crwood, dhoward, dvlasenk, fhrbata, fpacheco, hdegoede, hkrzesin, jarodwilson, jeremy, jforbes, jglisse, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mlangsdo, nmurray, ptalbert, qzhao, rvrbovsk, steved, tomckay, walters, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 5.12-rc6	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the Nosy driver in the Linux kernel. This issue allows a device to be inserted twice into a doubly-linked list, leading to a use-after-free when one of these devices is removed. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-04-09 23:35:17 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1948046
Bug Blocks:	1946491, 1946493

Description Guilherme de Almeida Suckevicz 2021-04-09 20:26:32 UTC

A flaw was found in the Nosy driver in the Linux kernel in versions prior to v5.12-rc6. It allows a device to be inserted twice into a doubly linked list, leading to use-after-free when one of these devices is removed.

Reference:
https://www.openwall.com/lists/oss-security/2021/04/07/1

Upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=829933ef05a951c8ff140e814656d73e74915faf

Comment 1 Guilherme de Almeida Suckevicz 2021-04-09 20:27:01 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1948046]

Comment 2 Product Security DevOps Team 2021-04-09 23:35:17 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-3483

Comment 3 Justin M. Forbes 2021-04-12 21:27:22 UTC

This was fixed for Fedora with the 5.11.12 stable kernel updates.